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#!/usr/bin/perl
use strict;
use warnings;
use utf8;

use RPM2;

for my $rpm_file (@ARGV) {
    my $package = RPM2->open_package($rpm_file)
        or die q{Could not open `} . $rpm_file . q{'.};

    my $package_name = $package->tag('NAME');
    my $package_version = $package->tag('VERSION');

    my $module_name = $package_name;
    $module_name =~ s/^([^-]+)-(.*)/$1($2)/;
    $module_name =~ s/-/::/g;
    
    my @names = $package->tag('PROVIDENAME');
    my @flags = $package->tag('PROVIDEFLAGS');
    my @versions = $package->tag('PROVIDEVERSION');
    if (!($#names == $#flags) && ($#names == $#versions)) {
        die (q{Inconsistent number of provides names, flags, and versions in `}
            . $rpm_file . q{'.});
    }

    my $found = 0;
    for my $name (@names) {
        my $flag = shift @flags;
        my $version = shift @versions;
        if ($name eq $module_name) {
            $found = 1;

            if (($flag & 0x8) && (($flag & (0x2+0x4)) == 0)) {
                if (!($package_version eq $version)) {
                    print $rpm_file . q{: Package version `} .
                        $package_version . q{' differs from `} .
                        $module_name . q{' module version `} .
                        $version . q{'.} . "\n";
                }
                last;
            } else {
                print $rpm_file . q{: `} . $module_name .
                    q{' in list of provides is not qualified (};
                printf '0x%x', $flag;
                print q{) as equaled.} . "\n";
            }
        }
    }

    if ($found == 0) {
        print $rpm_file . q{: missing `} . $module_name .
            q{' in list of provides.} . "\n";
    }
}

__END__
=encoding utf8

=head1 NAME

checkpackageversion - Check a RPM package version matches main Perl module
version

=head1 SYNOPSIS

checkpackageversion RPM_PACKAGE...

It opens each RPM_PACKAGE, guesses a main Perl module from package name, finds
it in list of provides (e.g. perl-Foo-Bar → perl(Foo::Bar) and compares
versions. It reports any irregularities to standard output.

Petr Písař <ppisar@redhat.com>

=head1 COPYING

Copyright (C) 2011  Petr Písař <ppisar@redhat.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

=cut